Hello help

Just because my period came on the third day of my first month being on the pill, does it mean it'll come on the third day on my second month? It's just that I'm waiting in anticipation and had unprotected sex this month so I'm worried, just want the bleed to let me know I'm not pregnant lol! I've been getting what looks like IB today and yesterday and my period is due today but must be just regular pill spotting, I've been getting a lot of spotting this month, sometimes quite heavy. Is this normal for it to not come exactly the same time for the first few months? Btw I've taken my pill perfectly every day and never missed one